Optimal region for design and control of ternary systems

Dynamic modeling and control structure design of an experimental fuel processor

“…Two control structures were studied. The first control structure uses the methane feed flow rate as the throughput manipulator (TPM) which is denoted as the on-supply control structure (CS1) [16][17][18][19]. The other control structure uses the hydrogen production rate as the throughput manipulator, denoted as the on-demand control structure (CS2) hereafter.…”

Design and control for recycle plants with heat-integrated separators

“…The process studied is a ternary system with the following reaction: A + B → C (Tyreus and Luyben, 1993;Cheng and Yu, 2003). Two reactants A and B are fed to a CSTR which is operated isothermally.…”

“…With given speciÿcations, we can complete the steady-state design for any given reactor product composition (z C ) and reactant distribution with di erent direction of heat integration. The steady-state conditions of all streams in the ternary recycle system are calculated from balance equations (Cheng and Yu, 2003). The low-pressure column is assumed to be at atmospheric and the pressure for the high-pressure column can be computed from the Clausius-Clapeyron equation…”

“…Therefore, the true optimal design may be obtained by inspection of the optimality for each sequence. Cheng and Yu (2003) give detailed derivation for this boundary. For the owsheet without energy integration, the results indicate that, for both sequences, the optimal paths start from the corner of heavy reactant (B) when z C is low (z C → 0) and, as the z C increases, they converge toward the center line which means equally distributed reactants (i.e., z A = z B ).…”

“…This work analyzes the tradeo between steady-state economics and dynamic controllability for heat-integrated recycle plants. The process consists of one reactor, two distillation columns, and two recycle streams ÿrst studied by Tyreus and Luyben (1993) and further explored by Cheng and Yu (2003) and, in this work, the two distillation columns are heat integrated.…”